package com.sky.aspect;


import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;

import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

//自定义切面,实现公共字段自动填充处理逻辑
@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    //指定切入点
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut(){}

    //定义前置通知,为公共字段赋值
    @Before("autoFillPointCut()")
    public void before(JoinPoint joinPoint){
        log.info("进行公共字段填充");

        //获取当前被拦截的方法上数据库的操作类型
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();//获得签名对象
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);//获得方法上的注解对象
        OperationType operationType = autoFill.value();//获得数据库操作类型

        //获取参数--实体对象
        Object[] args = joinPoint.getArgs();
        //防止空指针
        if (args == null || args.length == 0) {
            return;
        }
        Object obj = args[0];//TODO这里应当保证mapper中的参数employee都是第一个,逻辑有些危险,后续注意

        //准备赋值的数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();

        //根据当前不同的操作类型,为对象的属性通过反射来赋值
        if (operationType == OperationType.INSERT) {
            try {
                Method setCreateTime = obj.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME,LocalDateTime.class);
                Method setUpdateTime = obj.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME,LocalDateTime.class);
                Method setCreatUser = obj.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER,Long.class);
                Method setUpdateUser = obj.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER,Long.class);

                //通过反射为对象属性赋值
                setCreateTime.invoke(obj,now);
                setUpdateTime.invoke(obj,now);
                setCreatUser.invoke(obj,currentId);
                setUpdateUser.invoke(obj,currentId);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        }else if (operationType == OperationType.UPDATE) {
            try {
                Method setUpdateTime = obj.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME,LocalDateTime.class);
                Method setUpdateUser = obj.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER,Long.class);

                setUpdateTime.invoke(obj,now);
                setUpdateUser.invoke(obj,currentId);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }

        }

    }
}
